How old you goku in Dragon Ball Z?

Answer 1

Well it depends in what part of DBZ you want to know. According to various timelines Raditz arrived on Earth in 761AD at the beginning of DBZ, and the 28th Martial Arts World Tournament took place in 784AD at the end, so that's 23 years.

Goku was born in 737AD, so when Raditz arrives, Goku is 24, but with all the time he spends dead and in the hyperbolic time chamber over the years, it can get pretty confusing. I reckon by the end of DBZ he is about 48, but other people might work it out differently.